Thanks for the reactions and tips guys!
I'm leaning towards a Ca-reactor now... But I will build it myself. 
I will use the 
DaStaCo controller and pumps etc. but I will build the reactor myself. 
I have some experience with acrylic and PVC so I'm confident I can build a MONSTER reactor 
I will look into the Triton method, I already use their precise water analysis but haven't really looked into their method yet.
I use a shallow SB in the refugium just to give the pods some extra substrate and hold some more detritus for them to feed on 

 I don't have a SB in the frag tank